linux-kernel - Re: [RFC] ARM DMA mapping TODO, v1

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Message-ID: <20110429125613.616f977b@lxorguk.ukuu.org.uk>
Date:	Fri, 29 Apr 2011 12:56:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	linaro-mm-sig@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] ARM DMA mapping TODO, v1

> I believe that the PC graphics cards that have noncoherent DMA mappings
> are all of the unified memory (integrated into the northbridge) kind,
> so they are not on the same host bridge as all regular PCI devices,
> even if they appear as a PCI device.

The AGP GART is not coherent on a lot of systems - not necessarily
unified memory though, it can be a plug in AGP card too.
The GART is basically an IOMMU (and indeed in the later AMD case used
exactly as that)
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